body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100vh;
  background: #000;
}
body .layui-form {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  padding: 60px 40px;
  background-color: #ffffff;
  box-shadow: 0 15px 20px rgba(0, 0, 0, 0.2);
}
